Show I THE RELATION lAII N OF f S SOUND O TO m HEARING t m Topics In Nature Study for foi Schools in Winter Months GIVEN AT STATE UNIVERSITY How Iro 10 to Teach Tench Selena hy Imy II Ob And to lo Socialize by b Actual Uc Ute t c Th The n nature ture work for or tM the winter Inter months In the common raid eel all Prof Irot II n yesterday In Sn th the class diM at t the university should take lake up those thoro Iha subjects which may b be tt Irro of or the season esOn of ot the year tor such an as sound light heat h al mechanical principles principle etc ite The tail rail and the spring season ar are each distinguished by tw certain work to tobe he be done doni at these theat seasons only so 10 that thaI Independent topics may be considered during the winter months Each Bach ch topic should be approached by b experiment and from rain the of o the child own knowledge After Ater the subject Is the th knowledge e gained IH is utilized or made by b w some m form of 0 that Is II by Imy 11 show how showing ing ltd Its It relation to the childs Inter ems esta and activity and bv by b finding Irac rc rac Ural or profitable applications of or It U EXPERIMENTS IN 1 SOUND SOUD Several Se weeks of Interesting work may mil ma bu ha devoted t n 1 the subject t of or sound Found Ask the children of or what use me sound Is IA to them Visit a II climes class of at deaf dollt mutes and notice their devices to overcome their deficiency of or hearing Visit I lt a 11 band hand call attention to the dlf sounds Dod and their harmonIes lave have the children notice the differing acuteness of or hearing h among Animals and report Instances Instance of or tases of ot re rr hearing Show Know by b simple experiments that wind Is III due rlue to the vibratIons of or the sounding body bod by 11 ex x with lIh the which when sounding Is III easily tull proved to 10 b be beIn In hI n rapid vibration Further lurther expert ments showed that flint sound Is li lIt od ed by b waves waved In III the Ihl nir tim the difference hel between n noise 1101 and arid Inu lr the effect of or a sounding boArd etc ete h What Whal a spherical in air Is I like ilkI was ap liP approximately proximately shown hown n by 13 b snakIng making wave In water wiler by b sending a wave along a rope by h a I row of or buys bya b R In a line etc Any An simple yV on Oil may nitty maybe ma maIe be Ie used u ns nil H II basis for these the lessons lemon 1 Tho The of or spheres are proportional proportional proportional to 10 the squares of or their radii Thus Thu a sphere of or one aile foot has hall only ani one sIxteenth the of ot a with witha a n nadine of or four f rt ft t hence the th In of at the sound diminishes at t a II arate arate rate rote equal to 10 the square of or the dis distance tance from the sounding body bod PROPERTIES OF 01 SOUND SOrD The TIme different kinds of or media lr wood water Iron none ont one etc the fact that hat they transmit sound were next Investigated by 1 meat of or experiment That round require lime in to travel wax a brought out by b observation ob It goon goes 1060 LOGO feet per Ind through air at al 70 iO o degrees To Judge the dis dia distance lance tance about tive for or H II amIle mile mil To show the of or sound have hae the children hold two books or their hands alternately In front of or and AnS behind their mar MIT while the th organ orn Is playing 1 11 1 etc This Thill shows how the utility of or orthe the outer ear and nd the children may ilia how hol which animals the rabbit the deer et Eld need for their O external ears or ear trumpet to 10 rein reinforce reinforce force orre the he I sound At t this point a study of or time the ear Its nil Its II functions Its lIa power of nf selection etc Is tak tusk taken en tn up um because b nuI of or Its relation to the preceding topics |